Emilie De Ravin has revealed that she believes Claire is still alive on Lost.

Her alter-ego was last seen during the show's fourth season when she mysteriously disappeared, leaving her baby behind. She has since been referenced and has been confirmed as a series regular on season six.

Speaking to TV Guide, De Ravin said that she has filmed lots of scenes with Evangeline Lilly and added: "I think I'm alive, as far as I know."

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The 28-year-old actress has previously teased that she will make a return in an "unexpected" way.

Lost returns for its sixth and final season Tuesday, February 2 on ABC in the US and Friday, February 5 on Sky1 in the UK.